As with any server daemon that is accessible to the outside
world, it is advisable to run PostgreSQL under a separate user account. This
user account should only own the data that is managed by the
server, and should not be shared with other daemons. (For example,
using the user nobody is a bad idea.) It
is not advisable to install executables owned by this user because
compromised systems could then modify their own binaries.

To add a Unix user account to your system, look for a command
useradd or adduser. The user name postgres is often used, and is assumed
throughout this book, but you can use another name if you like.

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